A method for producing a sulfide solid electrolyte material, which is configured to allow the crystallization of a sulfide glass at low temperature. Provided is a method for producing a sulfide solid electrolyte material, the method comprising: amorphizing a raw material composition containing Li.sub.2S, P.sub.2S.sub.5, LiI, LiBr, a potassium-containing compound and Li.sub.3N to obtain a sulfide glass, and crystallizing the sulfide glass by hot-pressing the sulfide glass, wherein, when a first crystallization temperature of the sulfide glass is determined as X, and a second crystallization temperature of the sulfide glass is determined as Y, the first crystallization temperature X of the sulfide glass is 171 C. or less, and a temperature difference (YX) between the second crystallization temperature Y and the first crystallization temperature X is 75 C. or more.

A method for removing bubbles from molten glass is provided and involves subjecting the surface of the molten glass to at least one fining sequence wherein the fining sequence comprises subjecting the surface of the molten glass to a sub-atmospheric pressure (relative vacuum less one atmosphere of pressure) for a time followed by subjecting the surface of the molten glass to super-atmospheric gas pressure (greater than one atmosphere of pressure) for additional time. The fining sequence can be repeated as needed to produce a high quality optically clear glass that is substantially free of bubbles.

A transparent oxynitride glass that includes aluminum, calcium, magnesium, silicon, oxygen, and nitrogen, wherein the aluminum may be provided by an aluminum source comprising about 1 wt % to about 100 wt % aluminum nitride (AlN), based on the total weight of aluminum in the oxynitride glass and/or the nitrogen may be provided by an aluminum source comprising about 1 wt % to about 100 wt % aluminum nitride (AlN), based on the total weight of nitrogen in the oxynitride glass. The oxynitride glass may be substantially free of carbon. Also provided are uses of and articles comprising the oxynitride glass and methods of making the oxynitride glass.